Locket



FIG. 1 is a side elevational view of a locket showing my new design;

FIG. 2 is a top plan view; and

FIG. 3 is a bottom plan view.

The broken line showing of a cord in FIG. 1 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a locket, as shown and described. 